Door-spring



(No Model.) I

DOOR SPRING- No. 422,678. Patented Mar. 4, 1890.

wifmww a HWOQWFQD fiefiffmflw. I \R gh o cL v UNITED STATES PATENTOFFICE.

ROSTO O. WOOD, OF WORCESTER, MASSACHUSETTS.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 422,678, dated March 4,1890.

Application filed November 25, 1889. Serial No. 331,530. (No model.)

To all whom, it may concern:

Be it known that I, ROSTO O. \VOOD, of WVorcester, in the county oflVorcester and State of Massachusetts, have invented anew and usefulImprovement in Door Springs and Checks; andI do hereby declare thefollowing to be a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, forming a part of thisspecification, and in which Figure 1 represents a vertical section of adoor and its frame with my device thereon and showing the relativeposition of the parts thereof when the door is closed. Fig. 2 is a topView of the same with combination crank and lever in position when thedoor is wide open. Figs. 3, 4, and 5 represent the principal parts ofthis device and show the simplicity of their construction.

To enable others skilled in the art to which my invention appertainstomake and use the same, I will now describe more fully the various partsthereof and the manner of combining them for the successfulaccomplishment of the object for which it is designed.

The object of this device is to automatically close a door to which itmay be attached, or to prevent it being closed when desired to be leftopen; and it consists of the combination of a spiral spring with aneccentric or crank, or, what is still better, a combination crank-shaftand lever, made in one piece, (see Fig. 3,) and bracket E, with loop mpivoted thereto or made rigid thereon-and attached to a door and framethereof, as described and set forth.

sion-piece thereof. Now attach the other end of the spring to theadjusting-screw o, with extension-piece d, or in any other suitablemanner, the pivots 'i i being kept in position by a constant tension orcontraction of spring S. Next slip the loop on over the end ofcrank-lever c and fasten to the door, as shown in Fig. 1 at E. It is nowin order to do the Work for which it is designed, and it will be readilyseen that when the door 'is opened at right angles with the frame itwill close automatically, if allowed to do so, for to this point: thecrank will not have passed beyond the central line with the spring S;but when the door is thrown Wide open the crank portion of the leverwill have passed the central line, and by the contraction of the springit must be seen that the door will be prevented from closing exceptother force be applied.

It is designed to have the various parts of this device of malleableiron, steel, or other suitable material for utility and durability, andit must be observed that no drilling of the parts will be requiredaValuable desideratum to the cost of manufacture. The crank motion maybeeffected in several other ways without departing from the spirit ofmyinvention, none of which, however, Idesire to claim, nor do I claimthe principle of a crank motion and its application to a door forpurposes herein described in its broadest sense. i

What I do claim, and desire to secure by Letters Patent, is

The combination of the crank-lever O, having pivots i 1', bracket a,spring S, adjustingscrew 0 and extension-piece (Z', and combination loopand bracket m e, substantially as and for the purposes herein described.

ROSTO O. WOOD.

Witnesses:

JULIA B. Wool), E. S. MARTIN.

